The Colorado tech community cheered when email service SendGrid had its initial public offering in November. Finally, a home-grown business was moving to the level that so many startups aspire to. Less than a year later, SendGrid last week said it was being acquired for $2 billion in stock by Twilio, a firm that does what SendGrid does only with text messaging. While SendGrid said it’s committed to staying in Denver, Twilio’s headquarters are in San Francisco. This follows a string of acquisitions that has left the Denver area feeling more like a garden ripe for acquirers rather ...